单项选择题
A.串联分区的消防泵设置于各 B.消防水泵的压力相近 C.在高区的消防水泵扬程较大 D.无需高压泵及耐高压管
A.55%~60% B.55%~82% C.60%~82% D.70%~95%
A.15 B.20 C.25 D.30